Students will use Sphero to explore percentages using speed and color. The speed experiments are quantitative and the color experiments are qualitative. They will program the Sphero to move at 100% speed for a particular amount of time, and then measure how far it has gone. Then they will repeat the experiment with 50% and 30% speeds. They will calculate the speeds based on distance and time, andthen they will perform division to show that the smaller speeds are (roughly) the expected percentages of the 100% speed. Then they will be given a challenge to figure out what percentage of 100% speed isrequired to move Sphero to a certain position.